What President-elect Barack Obama needs to know about population

"Do we want jaguars with four wheels or four legs? What kind of world do we want?" — Joel E. Cohen on allocating earth's resources

Today, 6.7 billion people live on the planet. Nine billion are expected by 2050. Dare we call it overpopulation? Population expert Joel Cohen joins us to talk about population growth, and the role the White House can play in helping all of us live both comfortably and sustainably.